WO2007083661A1 - 光学ローパスフィルタ - Google Patents
光学ローパスフィルタ Download PDFInfo
- Publication number
- WO2007083661A1 WO2007083661A1 PCT/JP2007/050594 JP2007050594W WO2007083661A1 WO 2007083661 A1 WO2007083661 A1 WO 2007083661A1 JP 2007050594 W JP2007050594 W JP 2007050594W WO 2007083661 A1 WO2007083661 A1 WO 2007083661A1
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- WIPO (PCT)
- Prior art keywords
- layer
- refractive index
- pass filter
- low
- transparent conductive
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/46—Systems using spatial filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0006—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/26—Reflecting filters
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B19/00—Cameras
- G03B19/02—Still-picture cameras
- G03B19/12—Reflex cameras with single objective and a movable reflector or a partly-transmitting mirror
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/52—Elements optimising image sensor operation, e.g. for electromagnetic interference [EMI] protection or temperature control by heat transfer or cooling elements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/63—Control of cameras or camera modules by using electronic viewfinders
- H04N23/631—Graphical user interfaces [GUI] specially adapted for controlling image capture or setting capture parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
- H04N23/672—Focus control based on electronic image sensor signals based on the phase difference signals
Definitions
- the present invention relates to an optical low-pass filter (hereinafter sometimes referred to as a “Lonos filter”).
- the present invention relates to an optical aperture single-pass filter provided with a coating layer that has functions such as infrared ray blocking and antireflection.
- imaging devices such as electronic still cameras and video cameras that store images electronically are rapidly spreading. These imaging devices convert an object image formed by a photographic lens into an electrical signal for each pixel by an imaging element such as a CCD or a CMOS, and store it in a recording medium as image data.
- an imaging element such as a CCD or a CMOS
- the image pickup element since the image pickup element includes regularly arranged pixels on the light receiving surface, an object having a spatial frequency component approximate to the sample frequency determined by the pixel interval is detected. When the image is captured, moire appears in the image data of the subject.
- the imaging device since the imaging device has a spectral sensitivity different from that of the human eye and has high sensitivity to infrared light in addition to visible light, it is necessary to remove infrared light from the subject light. For this reason, a low-pass filter and an infrared blocking filter are generally disposed between the imaging lens and the imaging device.
- Patent Document 1 proposes that a transparent conductive film is provided on the surface of a low-pass filter substrate, and further an antireflection film is formed thereon to suppress reflection on the surface of the low-pass filter.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-33468
- the present invention has been made in view of such a conventional problem, and an object of the present invention is to provide an optical low-pass that effectively prevents dust from being attached due to static electricity without increasing the number of parts and the production process. To provide a filter.
- the optical low-pass filter according to the present invention includes a base material and a coating layer formed on the light incident surface side of the base material, and the coating layer has a high refractive index layer and a low refractive index.
- the refractive index layers are alternately stacked to reflect or transmit light in a specific wavelength range, and at least one of the high refractive index layers is formed of a transparent conductive material to prevent dust from adhering to the surface of the coating layer. I tried to do it.
- the coating layer may block infrared rays! /.
- the layer thickness of the high refractive index layer is 200 to 300 nm. It is preferable to be in the range.
- the thickness of the low refractive index layer on the substrate side in contact with the high refractive index layer formed of the transparent conductive material is 140 to 220 nm. The range is preferable.
- the transparent conductive material is preferably a mixture of indium oxide and tin oxide, and the indium oxide mixing ratio is 90% by weight or more.
- the outermost low refractive index layer is an equivalent layer composed of at least two layers of an MgF layer and an SiO layer.
- the MgF layer and the SiO layer be formed in order of the outer force.
- Each of the 2 2 2 2 2 layer thicknesses is preferably in the range of 20 to 80 nm.
- An imaging unit that achieves the above-described object includes the optical aperture single-pass filter according to any one of the above and an imaging element, and the coating layer of the optical low-pass filter is connected to a ground potential. It is characterized by.
- an imaging apparatus includes the imaging unit.
- a coat layer that reflects or transmits light in a specific wavelength region and in which a high refractive index layer and a low refractive index layer are alternately laminated is formed on the surface of the substrate.
- At least one of the high-refractive index layers of the gate layer is made of a transparent conductive material.
- the outermost high refractive index layer is formed of a transparent conductive material, the adhesion of dust can be further suppressed. Furthermore, if the total thickness of each refractive index layer formed outside the high refractive index layer formed of a transparent conductive material is 140 nm or less, good conductivity on the surface of the coating layer can be obtained, and simple grounding can be achieved. The structure can be grounded, and dust adhesion is further suppressed.
- the layer thickness of the high refractive index layer formed of a transparent conductive material is set in the range of 200 to 300 nm. As a result, the light reflection loss in the coat layer can be suppressed while ensuring the conductivity of the coat layer surface.
- the layer thickness of the low refractive index layer on the substrate side in contact with the high refractive index layer formed of a transparent conductive material is in the range of 140 to 220 nm, light reflection loss in the visible light region due to the coating layer is suppressed. Will be able to.
- a transparent conductive material is a mixture of indium oxide and tin oxide and has a mixing ratio of indium oxide of 90% by weight or more, light absorption can be suppressed.
- the outermost low refractive index layer is an equivalent layer composed of at least two layers of MgF layer and SiO layer.
- the thickness of MgF layer and SiO layer is 20-80nm respectively.
- the imaging unit and the imaging apparatus according to the present invention since the above-described optical low-pass filter is used, an optical element that reflects or transmits light in a specific wavelength range that has been separately provided conventionally is omitted. As a result, productivity can be improved and the size of the apparatus can be reduced. In addition, since dust is prevented from adhering to the surface of the optical low-pass filter, it is possible to obtain an image with high image quality.
- FIG. 1 is a schematic diagram showing an example of a low-pass filter according to the present invention.
- FIG. 2 is a schematic diagram showing another example of the low-pass filter according to the present invention.
- FIG. 3 is a schematic diagram showing still another example of the low-pass filter according to the present invention.
- FIG. 4 is a graph showing the transmittance when the layer thickness of the low refractive index layer directly under the ITO film is changed.
- FIG. 5A is a graph showing light absorption when the mixing ratio of indium oxide and tin oxide is changed.
- FIG. 5B is a graph showing light absorption when the mixing ratio of indium oxide and tin oxide is changed.
- FIG. 6A is a graph showing the transmittance when the mixing ratio of indium oxide and tin oxide is changed.
- FIG. 6B is a graph showing the transmittance when the mixing ratio of indium oxide and tin oxide is changed.
- FIG. 7 is a schematic diagram showing an example of an imaging unit according to the present invention.
- FIG. 8A is a front view showing an example of a camera (imaging device) according to the present invention.
- FIG. 8B is a rear view showing an example of a camera (imaging device) according to the present invention.
- FIG. 9A is an internal block diagram of the camera of FIGS. 8A and 8B.
- FIG. 9B is an internal configuration diagram of the camera of FIGS. 8A and 8B.
- FIG. 10 is a control block diagram of the camera of FIGS. 8A and 8B.
- FIG. 1 is a schematic diagram showing an embodiment of a low-pass filter according to the present invention.
- a coating layer 11 that blocks infrared rays is formed on the surface of a substrate 10.
- the coating layer 11 that blocks infrared rays is formed by alternately laminating high refractive index layers and low refractive index layers.
- One of the high refractive index layers is composed of an ITO (Indium Tin Oxide) film 11a made of a mixture of indium oxide and tin oxide, which is a transparent conductive material.
- ITO Indium Tin Oxide
- the outermost high refractive index layer be formed of a transparent conductive material. Since the low refractive index layer is usually formed on the outermost layer of the coat layer 11, the outermost high refractive index layer is usually the second layer from the outside.
- the high refractive index layer other than the outermost high refractive index layer may be formed of a transparent conductive material.
- the high refractive index layer is formed of a transparent conductive material.
- it is desirable that the total thickness D of the refractive index layers formed on the outer side is 140 nm or less. When the sum D of the layer thickness exceeds 140 nm, the conductivity of the surface of the coat layer is not sufficiently high, and dust adheres. This is because the prevention effect may be insufficient.
- the thickness of the high refractive index layer composed of the transparent conductive material is not particularly limited, and is appropriately determined from the specific material used as the transparent conductive material, the formation position of the layer composed of the transparent conductive material, and the like. Usually, the range of 200 to 300 nm is desirable. If the thickness of the high refractive index layer made of a transparent conductive material is less than 200 nm, sufficient conductivity may not be imparted to the surface of the coat layer. Conversely, if the layer thickness exceeds 300 nm, This is because light absorption may occur. More preferably, the layer thickness is in the range of 210-260 nm.
- the outermost layer of the coat layer is usually a low refractive index layer. Since this outermost layer is a layer to which dust adheres directly, it is desirable to form it with a material that does not physically adhere to dust. Fluorine compounds, especially MgF, are suitable as low refractive index and non-adhesive materials.
- Table 1 shows the experimental results.
- an ITO film was formed on the surface of a soda glass, and a low refractive index layer was formed thereon, and the solvent test, reliability test, and dust removal performance shown below were evaluated.
- the sample was left for 500 hours in an environment of each temperature and humidity, then left for 24 hours at room temperature and humidity, and then the sample surface was visually evaluated.
- the evaluation criteria are the same as in the solvent test.
- a powder of alumina or the like is sprayed on the surface of the low-pass filter. After vibrating the low-pass filter, the amount of powder remaining on the surface of the low-pass filter was visually evaluated.
- the evaluation criteria are as follows. “ ⁇ ”: Almost no remaining, “ ⁇ ”: Remains to the extent that the image is not affected, “X”: Remains to the extent that the image is affected
- the No. 2 sample had good dust removal performance. “Cloudy” occurred in the solvent test. In addition, in the samples of Experiment Nos. 6 to 9 where the ITO film was formed, there was a practical problem in the dust removal performance.
- the present inventors set the low refractive index layer, which is the outermost layer of the coat layer, as the MgF layer and the SiO layer.
- the laminated structure is ITO film, SiO layer,
- the outermost layer of the coating layer is composed of two layers, the MgF layer and the SiO layer.
- the layer thickness of 2 2 is preferably in the range of 20 to 80 nm, and the more preferred lower limit is 30 nm.
- the layer thickness d (shown in FIG. 3) of the low refractive index layer below the high refractive index layer formed of a transparent conductive material is preferably in the range of 140 to 220 nm.
- Fig. 4 shows the experimental results of simulating the transmittance of Sampnore with the layer thickness d changed to 92, 178, and 266 nm.
- the layer thickness d of the low refractive index layer is 178 nm
- the transmittance of the wavelength in the visible light region is almost 100%
- the layer thickness d is In the case of 92 nm and 266 nm
- the visible light wavelength transmission was 80 to 95%, and light reflection loss occurred in the coating layer.
- the transparent conductive material used in the present invention conventionally known materials can be used.
- ITO is preferred.
- FIGS. 5A, 5B, 6A, and 6B are graphs showing the amount of light absorption at each wavelength, with the horizontal axis representing wavelength (nm) and the vertical axis representing light absorption (%).
- 6A and 6B are graphs showing the transmittance at each wavelength with the horizontal axis representing wavelength (nm) and the vertical axis representing transmittance (%).
- Figure 5A shows the weight ratio of InO: SnO 86:14
- Figure 5B shows InO: SnO 95: 5.
- This graph shows the amount of light absorption in the TO film. Comparing the two graphs, it can be seen that the ITO film with InO: SnO of 95: 5 has less light absorption in the visible light region. Also
- Figure 6A shows the ITO film with InO: SnO of 86:14
- Figure 6B shows the InO: SnO with 95: 5.
- ITO having a mixing ratio of indium oxide of 90% by weight or more is suitable as the transparent conductive material used in the above.
- Examples of materials used as the base material of the low-pass filter include quartz, lithium niobate, and vanadium tetroxide.
- the layer structure of the coating layer may be such that high refractive index layers and low refractive index layers are alternately laminated so that desired effects such as infrared blocking and antireflection can be obtained.
- the total number of layers is about 30 to 40 layers.
- the material of the high refractive index layer in the coating layer is preferably at least one of titanium oxide, tantalum oxide, a mixture of titanium oxide and lanthanum oxide, and a mixture of titanium oxide and tantalum oxide.
- the material for the low refractive index layer is preferably at least one of acid silicate, acid aluminum, and a mixture of acid silicate and acid aluminum.
- the method for forming the coating layer is not particularly limited, and conventionally known methods such as a vacuum deposition method, IAD (Ion Assist Deposition) method, IP (Ion Plating) method, CVD (Chemical Vapor Deposition) method, and sputtering method are known. This method can be used.
- the film thickness of the fluorine coating film needs to be in a range that does not affect the optical characteristics. Specifically, about several nm is preferable.
- FIG. 7 shows a schematic diagram of an imaging unit 2 using the optical low-pass filter 1 according to the present invention.
- the imaging unit 2 in FIG. 7 has a box-shaped housing 22 with openings formed on the front and back sides, and a substantially “S” cross section attached to the periphery of the front opening so as to protrude toward the inside of the opening.
- CCD Charge Coupled Device
- An infrared shielding coating layer 11 is formed on the surface of the substrate 10 of the low-pass filter 1, and the outermost high refractive index layer of the infrared shielding coating layer 11 is formed of an ITO film 1 la as shown in FIG. .
- the infrared shielding coating layer 11 is connected to the ground potential through the mask sheet 25, the plate panel 26, the housing 22, and the substrate 24.
- the imaging unit 2 having such a configuration a special structure has been conventionally required to ensure conductivity, but the conductivity and the infrared blocking filter can be secured with a simple structure, and the number of parts is reduced. Can be suppressed. In addition, this makes it possible to reduce the size of the apparatus.
- the CCD 21 used here has R (red), G (green), and B (blue) color filters attached in a checkered pattern on the surface of each CCD in the two-dimensionally arranged area sensor.
- R red
- G green
- B blue
- CMOS complementary metal-oxide-semiconductor
- VMIS complementary metal-oxide-semiconductor
- FIG. 8A and FIG. 8B show an example of an electronic still camera including the optical low-pass filter and the imaging unit according to the present invention.
- FIG. 8A is a front view of an electronic still camera according to the present invention
- FIG. 8B is a rear view.
- the electronic still camera shown in FIGS. 8A and 8B is a single-lens reflex electronic still camera that includes a camera body 4 and an interchangeable lens 3 that is detachably attached to the front center of the camera body 4. .
- the camera body 4 has a mount part (Fig. Light for measuring the distance between the subject and the lens exchange button 41 for attaching / detaching the interchangeable lens near the mount, the grip part 42 for the user to hold on the front left side, and the subject.
- the control value setting dial 43 for setting the control value in the upper right part of the front, the mode setting dial 44 for switching the shooting mode in the upper left part of the front, and the upper surface of the grip part 42.
- a plurality of electrical contacts for electrical connection with the mounted interchangeable lens 3 and a plurality of force bras (not shown) for mechanical connection are provided. Is provided.
- the electrical contacts are obtained from a lens ROM (read-only memory) built in the interchangeable lens 3 with information specific to the lens (information such as the open F value and focal length) in the control unit (see Fig. 10), and information on the position of the focus lens and zoom lens in the interchangeable lens 3 is sent to the control unit.
- a lens ROM read-only memory
- the coupler is for transmitting the driving force of the focus lens driving motor and the driving force of the zoom lens driving motor provided in the camera body 4 to each lens in the interchangeable lens 3.
- the mode setting dial 44 is for setting a plurality of shooting modes including a still image shooting mode for shooting a still image and a moving image shooting mode for shooting a moving image.
- the release button 45 is configured to be able to perform a "half-pressed state” operation that is depressed halfway and a "full-pressed state” operation that is further depressed.
- a preparatory operation for shooting a still image of the subject preparation operations such as setting of exposure control values and focus adjustment
- the release button 45 is fully pressed.
- a shooting operation (a series of operations for exposing a color image sensor described later, performing predetermined image processing on an image signal obtained by the exposure, and recording the image signal on a memory card) is performed.
- a shooting operation exposure of the power image sensor, and predetermined image processing is performed on the image signal obtained by the exposure and the result is recorded on the memory card.
- the shooting operation is completed.
- a finder window 51 is provided in the upper center of the back surface of the camera body 4.
- the subject image from the interchangeable lens 3 is guided to the finder window 51.
- the photographer can view the subject by looking through the finder window 51.
- An external display section (liquid crystal display section) 52 is provided in the approximate center of the back of the camera body 4.
- the menu screen for setting the menu etc. is displayed, and the captured image recorded on the memory card is played back and displayed in the playback mode.
- a main switch 53 is provided in the upper left part of the external display unit 52.
- the main switch 53 also has a two-point slide switch. When the contact is set to the left “OFF” position, the power is turned off, and when the contact is set to the right “ON” position, the power is turned on.
- a jog dial key 54 On the right side of the external display section 52 , a jog dial key 54 is provided.
- the jog dial key 54 has a circular operation button so that the upper, lower, left and right four-direction pressing operations and the upper right, upper left, lower right and lower left pressing directions can be detected. It has become.
- the jog dial key 54 is multifunctional, and functions as an operation switch for changing the item selected on the menu screen for setting the shooting scene displayed on the external display unit 52, for example.
- the index screen on which a plurality of thumbnail images are arranged and displayed functions as an operation switch for changing the selected playback target frame.
- the jog dial key 54 can also function as a zoom switch for changing the focal length of the zoom lens of the interchangeable lens 3.
- a camera shake correction switch 56 is provided on the right side of the external display unit 52.
- the image stabilization switch 56 is turned on, the image stabilization function operates.
- switches 55 are provided below the external display unit 52 as switches for performing operations related to display and display contents of the external display unit 52.
- 9A and 9B show the internal configuration of the electronic still camera according to the present invention.
- 9A is a side sectional view showing the internal configuration of the electronic still camera in the shooting standby state
- FIG. It is side surface sectional drawing which shows the internal structure of the electronic still camera in a (light) state.
- the subject light beam that has passed through the photographing lens 31 of the interchangeable lens 3 is split into two light beams, a reflected light beam and a transmitted light beam, by the quick return mirror 61.
- the reflected light beam is imaged on the focusing screen 62 for finder observation, and the formed subject image is observed from the finder eyepiece window 65 through the pentagonal prism 63 and the eyepiece lens 64.
- the transmitted light beam is reflected by a sub-mirror 66 provided on the back surface of the quick return mirror 61 and guided to the focus detection sensor 67 for autofocus.
- the focus detection sensor 67 detects focus information of the subject.
- An imaging unit 2 with a built-in CCD 21 shown in FIG. 7 is attached behind the quick return mirror 61 via a shutter 68.
- the shirt 68 is controlled to open and close during exposure.
- An example of the shutter 68 is a longitudinally running focal plane shutter.
- FIG. 10 is a block diagram showing an example of the electrical configuration of the electronic still camera according to the present invention.
- the electronic still camera includes a camera body 4, an interchangeable lens 3, an imaging unit 70, a signal processing unit 80, a control unit 90, a focus control unit 91, an LCD (display unit) 93, an operation unit 94, and the like.
- the interchangeable lens 3 includes various types of information such as photographing lenses 31a and 31b for forming a subject image on the CCD 73, a lens position detecting unit 320 for detecting the position of the photographing lens, a control unit 90 on the main body side.
- a control unit 310 is provided for performing communication and controlling various lenses.
- the various lenses incorporated in the interchangeable lens 3 are moved to predetermined positions by a lens driving motor Ml that is driven based on a control signal output from the control unit 90 via the focus control unit 91.
- the imaging unit 70 photoelectrically converts a subject light image incident through the interchangeable lens 3 to generate an image signal.
- the mirror mechanism 71 includes a quick return mirror 61 (shown in FIGS. 9A and 9B) and a sub mirror 66 (shown in FIGS. 9A and 9B), and divides the subject luminous flux for viewfinder observation and autofocus.
- the motor M2 is driven based on the retract signal output from the mirror control unit 75, and the quick return mirror 61 and the sub mirror 66 are retracted from the optical axis of the interchangeable lens 3.
- the ON signal of the release switch 45 shown in FIGS. 8A and 8B
- the evacuation signal is generated by the control unit 90 and output to the mirror control unit 75.
- the shirter 72 opens and closes when the motor M3 is driven based on a signal from the shirter control unit 76.
- the CCD 73 Based on the drive control signal (accumulation start signal-accumulation end signal) input from the timing control circuit 77, the CCD 73 receives a subject light image for a predetermined exposure time and converts it into an image signal (charge accumulation signal). Then, the image signal is sent to the signal processing unit 80 in accordance with a read control signal (horizontal synchronization signal, vertical synchronization signal, transfer signal, etc.) input from the timing control circuit 77. At this time, the image signal is separated into color components R, G, and B and sent to the signal processing unit 80.
- a read control signal horizontal synchronization signal, vertical synchronization signal, transfer signal, etc.
- the CCD drive mechanism 74 moves the CCD 73 in a direction to cancel the blur.
- the bi-directional blur detected by the gyro sensor 97 is converted into a blur correction drive signal by the control unit 90 and sent to the CCD drive mechanism 74. As a result, the CCD driving mechanism 74 is driven.
- the light reception signal of each pixel is converted to a pixel signal (analog value) as necessary.
- pixel data digital value
- the timing control circuit 77 controls the photographing operation of the CCD 73, and generates a photographing control signal based on the control signal input from the control unit 90.
- This imaging control signal includes a reference clock signal, a timing signal (synchronous clock signal) for signal processing of the image signal sent from the CCD 73 by the signal processing unit 80, and the like.
- This timing signal is input to the analog signal processing circuit 81 and the AZD conversion circuit 82 in the signal processing unit 80.
- the signal processing unit 80 performs predetermined analog signal processing and digital signal processing on the image signal transmitted from the CCD 73, and the signal processing of the image signal is performed for each pixel signal constituting the image signal. Is called.
- the signal processing unit 80 includes an analog signal processing circuit 81, an AZD conversion circuit 82, a black level correction circuit 83, a white balance (WB) circuit 84, a ⁇ correction circuit 85, and an image memory 86.
- the WB circuit 84 and the ⁇ correction circuit 85 constitute a circuit that performs digital signal processing.
- the analog signal processing circuit 81 performs predetermined analog signal processing on the analog image signal output from the CCD 73, and is a C DS (correlated double sampling) circuit that reduces sampling noise of the image signal. And an AGC (auto gain control) circuit that adjusts the level of the image signal.
- the AGC circuit reduces the level of the captured image when the aperture value built into the interchangeable lens 3 and the exposure time of the CCD 73 cannot achieve proper exposure (for example, when shooting very low-luminance subjects). It also has a function to compensate.
- the gain of the AGC circuit is set by the control unit 90.
- the AZD conversion circuit 82 converts the image signal output from the analog signal processing circuit 81 into a digital value image signal (hereinafter referred to as "image data"), and is obtained by receiving light at each pixel.
- image data is converted into, for example, 12-bit pixel data.
- the black level correction circuit 83 corrects the black level of each AZD converted pixel data to a reference black level.
- the WB circuit 84 adjusts the white balance of the photographed image, and shoots by converting the pixel data levels of the color components R, G, and ⁇ using the level conversion table input from the control unit 90. Adjust the white balance of the image.
- the conversion coefficient for each color component in the level conversion table is set for each captured image by the control unit 90.
- the ⁇ correction circuit 85 performs gradation correction by correcting the ⁇ characteristics of the pixel data, and has a plurality of types of ⁇ correction tables with different y characteristics as a look-up table (LUT) and is set.
- ⁇ correction of pixel data is performed using a predetermined ⁇ correction table according to the shooting scene.
- 14-bit pixel data is converted to 8-bit (256 gradations) pixel data.
- the pixel data before ⁇ correction processing is 14-bit data! This is a strong nonlinearity and prevents image quality deterioration when ⁇ correction is performed with ⁇ characteristics. Because.
- the pixel data of each color component R, G, B is subjected to a predetermined level conversion by the WB circuit 84, and each of these pixel data is ⁇ corrected by the ⁇ correction table.
- the image memory 86 is a memory for temporarily storing image data for which signal processing has been completed, and has a capacity capable of storing image data for a plurality of frames.
- the LCD (display unit) 93 includes a VRAM 92!
- the VRAM 92 is a buffer memory for storing a display image on the LCD 93, and has a memory capacity capable of storing 400 ⁇ 300 color pixel data corresponding to the number of pixels of the LCD 93.
- the operation unit 94 includes a release switch that is turned on when the release button 45 (shown in FIGS. 8A and 8B) is fully pressed, a mode setting dial 44 (shown in FIGS. 8A and 8B), and the like.
- the operation information is input to the control unit 90.
- the control unit 90 includes a CPU (Central Processing Unit) and the like, and stores a ROM that stores a control program for controlling the operation of the CPU of the control unit 90 and various types of data in the arithmetic processing and control processing. RAM to store automatically.
- CPU Central Processing Unit
- ROM Read Only Memory
- the control unit 90 is connected to the memory card 96 via the card IZF95.
- Card I
- the ZF 95 is an interface for writing image data to the memory card 96 and reading image data.
- the memory card 96 records image data such as still images and moving images.
- the control unit 90 is connected to a communication IZF 101 such as a USB terminal. This
- the flash 102 illuminates the subject when shooting in a dark place, and the flash circuit 98 controls light emission.
- the phase difference AF module 100 is for obtaining an AF signal.
- AF-assist beam 99 is a phase difference AF module when shooting in dark places 1
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/909,260 US8437084B2 (en) | 2006-01-23 | 2007-01-17 | Optical low-pass filter |
EP07713630A EP1857843A1 (en) | 2006-01-23 | 2007-01-17 | Optical low-pass filter |
CN2007800001159A CN101310197B (zh) | 2006-01-23 | 2007-01-17 | 光学低通滤波器 |
Applications Claiming Priority (2)
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JP2006-013666 | 2006-01-23 | ||
JP2006013666A JP4462197B2 (ja) | 2006-01-23 | 2006-01-23 | 光学ローパスフィルタ |
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WO2007083661A1 true WO2007083661A1 (ja) | 2007-07-26 |
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PCT/JP2007/050594 WO2007083661A1 (ja) | 2006-01-23 | 2007-01-17 | 光学ローパスフィルタ |
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US (1) | US8437084B2 (ja) |
EP (1) | EP1857843A1 (ja) |
JP (1) | JP4462197B2 (ja) |
KR (1) | KR20080101641A (ja) |
CN (1) | CN101310197B (ja) |
TW (1) | TW200739145A (ja) |
WO (1) | WO2007083661A1 (ja) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4693836B2 (ja) | 2007-12-17 | 2011-06-01 | 日本電波工業株式会社 | 赤外線カットフィルタ及びその製造方法 |
CN102016677B (zh) * | 2008-06-25 | 2013-05-08 | 柯尼卡美能达精密光学株式会社 | 成像光学*** |
TWI422894B (zh) * | 2009-11-30 | 2014-01-11 | Himax Semiconductor Inc | 晶圓級光學攝像裝置 |
JP5064586B2 (ja) * | 2010-06-14 | 2012-10-31 | パナソニック株式会社 | 遮蔽構造および撮像素子支持構造 |
DE102010048088A1 (de) * | 2010-10-01 | 2012-04-05 | Carl Zeiss Vision Gmbh | Optische Linse mit kratzfester Entspiegelungsschicht |
US8648990B2 (en) * | 2010-11-15 | 2014-02-11 | Nec Corporation | Optical device |
JP5269933B2 (ja) * | 2011-03-02 | 2013-08-21 | 日本電波工業株式会社 | 光学多層膜フィルタ |
KR20140068982A (ko) * | 2011-09-21 | 2014-06-09 | 아사히 가라스 가부시키가이샤 | 근적외선 커트 필터 |
JP6035768B2 (ja) * | 2012-02-16 | 2016-11-30 | セイコーエプソン株式会社 | 干渉フィルター、光学モジュール、および電子機器 |
CN102800730A (zh) * | 2012-07-09 | 2012-11-28 | 友达光电股份有限公司 | 光伏装置 |
JP5923441B2 (ja) * | 2012-12-21 | 2016-05-24 | 株式会社ジャパンディスプレイ | 表示装置及びヘッドアップディスプレイ |
KR101723401B1 (ko) * | 2013-08-12 | 2017-04-18 | 주식회사 만도 | 야간 카메라 영상 저장 장치 및 그 영상 저장 방법 |
KR20170125905A (ko) * | 2015-03-09 | 2017-11-15 | 비전 이즈, 엘피 | 정전기 방지 및 반사 방지 코팅 |
JP6943249B2 (ja) * | 2016-08-18 | 2021-09-29 | Agc株式会社 | 積層体、電子デバイスの製造方法、積層体の製造方法 |
CN113905150A (zh) * | 2020-06-22 | 2022-01-07 | 三赢科技(深圳)有限公司 | 摄像头模组及电子装置 |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5890604A (ja) * | 1981-11-25 | 1983-05-30 | Toyota Central Res & Dev Lab Inc | 赤外線遮蔽積層体 |
JPS61168899A (ja) * | 1985-01-19 | 1986-07-30 | 日本板硝子株式会社 | 低反射率帯電防止板 |
JPS63137301U (ja) * | 1987-03-02 | 1988-09-09 | ||
JPH0634802A (ja) * | 1992-07-20 | 1994-02-10 | Fuji Photo Optical Co Ltd | 導電性反射防止膜 |
JPH08262225A (ja) * | 1995-03-27 | 1996-10-11 | Gunze Ltd | 光学薄膜 |
JPH09325211A (ja) * | 1996-04-01 | 1997-12-16 | Toray Ind Inc | 光学フィルター |
JP2000221322A (ja) * | 1999-02-01 | 2000-08-11 | Sony Corp | 紫外赤外線カットフィルタ及び投射型表示装置 |
JP2002033468A (ja) * | 2000-07-18 | 2002-01-31 | Canon Inc | 固体撮像装置 |
JP2002251144A (ja) * | 2000-02-01 | 2002-09-06 | Mitsui Chemicals Inc | ディスプレイ用フィルタ、表示装置およびその製造方法 |
JP2002299594A (ja) * | 2001-04-03 | 2002-10-11 | Toppan Printing Co Ltd | 赤外線反射膜を有する固体撮像素子及びその製造方法 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL106520C (ja) * | 1956-09-01 | 1900-01-01 | ||
US5667880A (en) * | 1992-07-20 | 1997-09-16 | Fuji Photo Optical Co., Ltd. | Electroconductive antireflection film |
TW320687B (ja) * | 1996-04-01 | 1997-11-21 | Toray Industries | |
US6926952B1 (en) * | 1998-01-13 | 2005-08-09 | 3M Innovative Properties Company | Anti-reflective polymer constructions and method for producing same |
MXPA02007162A (es) * | 2000-01-26 | 2003-09-22 | Sola Int Holdings | Revestimiento antiestatica, antirreflejante. |
EP1267318A4 (en) | 2000-02-01 | 2005-12-14 | Mitsui Chemicals Inc | DISPLAY FILTER, DISPLAY, AND PRODUCTION METHOD THEREFOR |
DE60127662T2 (de) * | 2000-04-07 | 2007-12-27 | The Chief Controller, Research And Development, Defence Research And Development Organisation Of Ministry Of Defence | Sende-/empfängermodul für aktivphasenarrayantenne |
JP4277721B2 (ja) * | 2003-05-02 | 2009-06-10 | セイコーエプソン株式会社 | 光学ローパスフィルタの製造方法 |
-
2006
- 2006-01-23 JP JP2006013666A patent/JP4462197B2/ja not_active Expired - Fee Related
-
2007
- 2007-01-02 TW TW096100056A patent/TW200739145A/zh unknown
- 2007-01-17 WO PCT/JP2007/050594 patent/WO2007083661A1/ja active Application Filing
- 2007-01-17 US US11/909,260 patent/US8437084B2/en active Active
- 2007-01-17 CN CN2007800001159A patent/CN101310197B/zh not_active Expired - Fee Related
- 2007-01-17 EP EP07713630A patent/EP1857843A1/en not_active Withdrawn
- 2007-01-17 KR KR1020077021888A patent/KR20080101641A/ko not_active Application Discontinuation
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5890604A (ja) * | 1981-11-25 | 1983-05-30 | Toyota Central Res & Dev Lab Inc | 赤外線遮蔽積層体 |
JPS61168899A (ja) * | 1985-01-19 | 1986-07-30 | 日本板硝子株式会社 | 低反射率帯電防止板 |
JPS63137301U (ja) * | 1987-03-02 | 1988-09-09 | ||
JPH0634802A (ja) * | 1992-07-20 | 1994-02-10 | Fuji Photo Optical Co Ltd | 導電性反射防止膜 |
JPH08262225A (ja) * | 1995-03-27 | 1996-10-11 | Gunze Ltd | 光学薄膜 |
JPH09325211A (ja) * | 1996-04-01 | 1997-12-16 | Toray Ind Inc | 光学フィルター |
JP2000221322A (ja) * | 1999-02-01 | 2000-08-11 | Sony Corp | 紫外赤外線カットフィルタ及び投射型表示装置 |
JP2002251144A (ja) * | 2000-02-01 | 2002-09-06 | Mitsui Chemicals Inc | ディスプレイ用フィルタ、表示装置およびその製造方法 |
JP2002033468A (ja) * | 2000-07-18 | 2002-01-31 | Canon Inc | 固体撮像装置 |
JP2002299594A (ja) * | 2001-04-03 | 2002-10-11 | Toppan Printing Co Ltd | 赤外線反射膜を有する固体撮像素子及びその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN101310197B (zh) | 2010-12-08 |
JP2007193264A (ja) | 2007-08-02 |
KR20080101641A (ko) | 2008-11-21 |
EP1857843A1 (en) | 2007-11-21 |
TW200739145A (en) | 2007-10-16 |
US8437084B2 (en) | 2013-05-07 |
US20110116162A1 (en) | 2011-05-19 |
CN101310197A (zh) | 2008-11-19 |
JP4462197B2 (ja) | 2010-05-12 |
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